MathematicsBinary operationsJAMB
The operation ∆ is defined on real numbers by a ∆ b = a + b − 3. Find the identity element.
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Answer: B. 3
a ∆ e = a gives a + e − 3 = a, so e = 3.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.